Post Reply 
Articles or book(s) about the functions behind a scientific calculator
11-23-2018, 06:00 PM (This post was last modified: 11-23-2018 09:11 PM by SlideRule.)
Post: #25
RE: Articles or book(s) about the functions behind a scientific calculator
Chapter 7 The CORDIC Algorithm (pgs 133-156) of Elementary Functions algorithms & implementation 2e by Jean-Michel Muller {© 2006 Birkhäuser} may also be of interest.
excerpt from Chapter 1
This book is devoted to the computation of the elementary functions. Here, we
call elementary functions the most commonly used mathematical functions: sin, cos, tan, sin⁻¹,
cos⁻¹, tan⁻¹, sinh, cosh, tanh, sinh⁻¹, cosh⁻¹, tanh⁻¹, exponentials, and logarithms (we should
merely say “elementary transcendental functions”: from a mathematical point of view, ¹/x is an
elementary function as well as e^x. We do not deal with the basic arithmetic functions in this
book). Theoretically, the elementary functions are not much harder to compute than quotients: it
was shown by Alt [4] that these functions are equivalent to division with respect to Boolean
circuit depth. This means that, roughly speaking, a circuit can output n digits of a sine, cosine,
or logarithm in a time proportional to log n (see also Okabe et al. [249], and Beame et al. [25]).
For practical implementations, however, it is quite different, and much care is necessary if we
want fast and accurate elementary functions.

BEST!
SlideRule
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
RE: Articles or book(s) about the functions behind a scientific calculator - SlideRule - 11-23-2018 06:00 PM



User(s) browsing this thread: 13 Guest(s)